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Forum: Reliability & Maintainability Questions and Answers

Topic: Reliability & Maintainability Questions and Answers

Topic Posted by: Reliability & Maintainability Forum (src_forum@alionscience.com )
Organization: System Reliability Center
Date Posted: Mon Aug 31 12:47:36 US/Eastern 1998

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Original Message:

Posted by: Chua Peck Seng
Date posted: Sun Jul 27 21:12:04 US/Eastern 2003
Subject: Junction Temperature
Message:
Based on thermal analysis, measurement and thermal resistance given by IC manufacturers, we've estimated in our developmental systems, some of the junction temperature of the commercial grade ICs have exceeded the maximum junction temperature of 150 degrees. We're thinking of changing these ICs to industrial grade. However, is there any difference in the junction temperature for commercial and industry grade ICs ?


Reply:

Subject: Junction Temperatures
Reply Posted by: BWD (bdudley@alionscience.com )
Organization: RAC
Date Posted: Tue Jul 29 9:53:02 US/Eastern 2003
Message:
Most commercial and industrial grade devices have temperature limits where full electrical performance is guaranteed. Commercial grade temperature limits are usually 0 to 70 degrees C. Industrial grade devices may be as high as 100 degrees C. Neither will work to full specification electrical performance at 150 or greater degrees C. It is unusual to have environmental requirements that require such high temperatures, perhaps you should consider advanced cooling characteristics to reduce the junction temperatures by decreasing the base temperature.


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